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|previous: Aron On the memory man schematic:||View Thread|
|10/11/1999 2:36 AM|
|Don Symes||Re: Need +15 volts from schematic|
Something to notice - the 4047, a CMOS logic part with VDD at pin 14 and VSS at pin 7 - is being run with VDD at GND, and VSS at some negative voltage (didn't notice if -15 or what). For some reason, they're running this circuit 'upside down'.
I also failed to find where B1, B2, etc go. Is there another page or some stuff missing?
Flipping the circuit over to run from a 'positive' supply shouldn't be too tough. The IC pins at GND go to +15, the pins at -15 go to gnd. The opamp and transistor biasing will have to be re-thought.
Any particular reason for your concern?
|Aron I gave up. I understand how it work... -- 10/11/1999 3:19 AM|
AMZ The circuit uses a negative voltage... -- 10/11/1999 9:34 AM